Heat Shock Protein 60 Is a $Mg^{2+}$-dependent, Membrane-associated and Neutral Sphingomyelinase That Mediates TNF-alpha Signaling

  • Jung, Sang-Mi (Department of Environmental & Health Chemistry, College of Pharmacy, Chung-Ang University) ;
  • Jung, Sung-Yun (Department of Environmental & Health Chemistry, College of Pharmacy, Chung-Ang University) ;
  • Chang, Dong-Hoon (Department of Environmental & Health Chemistry, College of Pharmacy, Chung-Ang University) ;
  • Jeong, Hyun-Chul (Department of Environmental & Health Chemistry, College of Pharmacy, Chung-Ang University) ;
  • Chin, Mi-Reyoung (Department of Environmental & Health Chemistry, College of Pharmacy, Chung-Ang University) ;
  • Jeong, Eui-Man (Department of Environmental & Health Chemistry, College of Pharmacy, Chung-Ang University) ;
  • Jo, Dong-Hwan (Department of Environmental & Health Chemistry, College of Pharmacy, Chung-Ang University) ;
  • Jeon, Hyung-Jun (Department of Environmental & Health Chemistry, College of Pharmacy, Chung-Ang University) ;
  • Jung, Kwnag-Mook (Department of Environmental & Health Chemistry, College of Pharmacy, Chung-Ang University)
  • Published : 2003.10.01

Abstract

The hydrolysis of sphingomyelin (SM), known as the SM pathway, is induced by the activation of sphingomyelinase (SMase) to generate the second messenger ceramide, which plays a key role in cellular responses such as apoptosis, differentiation, senescence, and inflammation. Here, we identified a 60 kDa membrane-associated, neutral and Mg$\^$2+/-dependent SMase, termed N-SMase $\varepsilon$, from mammalian brains, which was revealed as the heat shock protein 60 (HSP60) through cDNA cloning and mass spectrometrical analysis. (omitted)

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